Safe ash treatment device for metal 3D printing equipment
By designing a safety treatment device for metal 3D printing equipment, the ash discharge pipe, ash conveying pipeline and flame retardant liquid are used to achieve a fully enclosed and safe treatment of ash, solving the problems of safety hazards and low operating efficiency in the prior art, and improving safety and operating efficiency.
Patent Information
- Application Number
- CN202421255174.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-06-04
AI Technical Summary
The ash treatment method of existing metal 3D printing equipment has safety hazards and low operating efficiency. Operators need to manually deal with flammable and explosive ash, and the working efficiency is low.
Design a safety treatment device for ash slag for metal 3D printing equipment. Through the combination of filters and ash barrels, ash discharge pipes, ash slag conveying pipes and flame retardant liquids are used, combined with inert gas and stirring paddles, to achieve fully enclosed and safe treatment of ash slag and avoid manual direct contact with ash.
The fully enclosed and safe treatment of ash is achieved, which reduces the safety risks of operators, improves operating efficiency and convenience, and avoids the risk of spontaneous combustion of ash.
Smart Images
Figure CN222767307U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of metal 3D printing, and in particular to a slag safety treatment device for metal 3D printing equipment. Background Art
[0002] Metal 3D printing is a manufacturing process that gradually builds the required metal workpiece by melting and stacking metal powder layer by layer. This manufacturing method has high flexibility and customization capabilities, and is suitable for industries such as aerospace, medical, and automotive, and can achieve metal additive manufacturing with complex geometries and innovative designs.
[0003] During the metal 3D printing process, the laser beam sintering metal powder produces byproduct ash slag, which will affect the quality of the workpiece. In order to increase the yield rate of the workpiece, a dust removal system is usually installed on the metal 3D printing equipment 27. Specifically, Figure 1 As shown, it is a schematic diagram of the structure of the dust removal system in the prior art, which mainly includes a filter 1, a filter element 23 is arranged in the filter 1 to divide the inner cavity of the filter 1 into a clean air chamber 24 and a dust air chamber 25 arranged at the upper and lower parts, the dust air chamber 25 is connected to the air outlet 28 of the printing device 27 through the air inlet pipe 26, and the clean air chamber 24 is connected to the air inlet 30 of the printing device 27 through the air outlet pipe 29. The printing device 27 is filled with circulating inert gas, and a power fan 31 is installed on the air outlet pipe 29 to drive the circulating inert gas to run along the printing device 27, the air inlet pipe 26, the dust air chamber 25, the clean air chamber 24 and the air outlet pipe 29 in sequence. In this process, the circulating inert gas can carry the ash from the printing work area to the dust air chamber 25, and purify it through the filter element 23, and the filtered clean gas can be returned to the printing device 27 for reuse.
[0004] like Figure 2 As shown, in order to extend the service life of the filter element 23 and reduce the replacement cost of the filter element 23, a back-blowing device 32 is usually provided on the top of the filter 1 to reversely blow and dust the filter element 23. At this time, the ash separated from the filter element 23 can fall into the ash bucket 2 at the bottom of the filter 1, so as to facilitate the collection and cleaning of the ash. Since the ash is prone to oxidation reaction and heat release when it meets the air, there is a certain risk of spontaneous combustion, so the ash needs to be safely handled regularly.
[0005] At present, the commonly used ash treatment methods in the industry are mainly divided into: ① When the amount of ash in the ash bucket 2 accumulates to the upper limit, the operator needs to manually disassemble the ash bucket 2 and directly dump the ash into the excess water. ② Before disassembling the ash bucket 2, limestone is introduced into the ash bucket 2 as a passivating agent, and then the ash is dumped into the excess water. ③ Before disassembling the ash bucket 2, flame retardants such as sand, methyl silicone oil, and water are introduced into the ash bucket 2. Subsequently, the ash bucket 2 is moved to the fire treatment site, and the mixture in the bucket is dumped into a container filled with excess water or methyl silicone oil. Then, the ash is stirred with the liquid in the container to ensure full and uniform mixing, and finally a flocculant is added to promote the sedimentation of the ash.
[0006] The above-mentioned ash treatment method has the following problems: ① The entire ash treatment process needs to be completed manually by the operator, which makes the operator directly contact with flammable and explosive substances (i.e. ash) throughout the process, posing a serious safety hazard. ② The efficiency of manual ash treatment is relatively low, especially in large-scale printing operations, which consumes a lot of man-hours and increases operating costs. Therefore, there is still room for improvement. Utility Model Content
[0007] In view of the shortcomings of the prior art, the utility model provides a slag safety treatment device for metal 3D printing equipment, which can realize the fully enclosed and safe treatment of slag in the ash bucket, thereby avoiding direct contact between operators and slag, reducing safety risks, saving operators' operating hours, and improving work efficiency and convenience.
[0008] In order to solve the above technical problems, the utility model is solved by the following technical solutions:
[0009] A slag safety treatment device for metal 3D printing equipment comprises a filter and an ash bucket arranged at the bottom of the filter, an ash discharge pipe is arranged between the ash bucket and the filter, a first switch for opening or closing the ash discharge pipe is arranged on the ash discharge pipe, an ash conveying pipeline is arranged at the bottom of the ash bucket, an end of the ash conveying pipeline away from the ash bucket extends into a closed container, a flame retardant liquid is contained in the closed container to immerse the end of the ash conveying pipeline away from the ash bucket, a second switch for opening or closing the ash conveying pipeline is arranged on the ash conveying pipeline, a gas source for outputting inert gas is connected to the side of the ash bucket through an air supply pipe, and a third switch for opening or closing the air supply pipe is arranged on the air supply pipe;
[0010] When the first switch turns on the ash discharge pipe and the second switch turns off the ash conveying pipe, and the third switch turns off the air supply pipe, the ash separated in the filter can fall into the ash bucket through the ash discharge pipe;
[0011] When the first switch cuts off the ash discharge pipe and the second switch turns on the ash conveying pipe, and the third switch turns on the air supply pipe, the gas source can output inert gas to the ash bucket through the air supply pipe to blow the ash in the ash bucket into the flame retardant liquid through the ash conveying pipe.
[0012] With the above solution, during the ash treatment process, the operator only needs to control the first switch and the second switch, and regularly treat the passivated ash-liquid mixture, and no manual intervention is required for other treatment processes. In this way, the operator can be prevented from directly contacting flammable and explosive substances (i.e. ash), thereby improving safety, and improving operating efficiency and convenience.
[0013] Preferably, a stirring paddle is provided in the flame retardant liquid, and a power source connected to the stirring paddle to drive the stirring paddle to operate is provided on the closed container.
[0014] By adopting the above solution, the stirring paddle can fully mix the ash and the flame retardant liquid, thereby preventing the ash floating above the flame retardant liquid from spontaneously combusting, thereby further improving safety.
[0015] Preferably, a cutting mesh for cutting bubbles is provided at a port of the ash conveying pipeline away from the ash bucket.
[0016] With the above solution, if the gas flow rate output by the gas source is large, the inert gas will form large bubbles in the flame retardant liquid. Large bubbles will carry ash and float to the surface of the flame retardant liquid at a faster speed, which is not conducive to the mixing of ash and flame retardant liquid. Therefore, using a cutting mesh to divide the larger bubbles entering the flame retardant liquid into small bubbles is more conducive to the full mixing of ash and flame retardant liquid in the bubbles, further reducing the risk of spontaneous combustion of ash.
[0017] Preferably, a vent is provided at the top of the sealed container.
[0018] By adopting the above solution, the exhaust port can allow excess inert gas to be discharged from the closed container, so that the entire ash treatment device can operate normally.
[0019] Preferably, an annular flow guide pipe is arranged around the inner wall of the ash bucket, and air supply ports extending outward to the outside of the ash bucket are arranged on both sides of the annular flow guide pipe, and two air supply pipes are arranged and respectively connected to the two air supply ports, and both air supply pipes are connected to an air source to receive inert gas output by the air source, and two third switchers are also arranged and respectively arranged on the two air supply pipes, and a plurality of air jets are arranged around the annular lower end surface of the annular flow guide pipe.
[0020] By adopting the above scheme, the annular guide pipe can optimize the air flow direction of the inert gas in the ash bin, supply air to both sides of the annular guide pipe at the same time through two air supply pipes, and spray air through a number of jet nozzles arranged on the lower end surface of the annular guide pipe, which can avoid the problem of uneven flow field distribution in the ash bin caused by air intake through a single air supply pipe, thereby improving the cleaning efficiency and reducing the loss of inert gas.
[0021] Preferably, the diameters of the plurality of air jets increase sequentially along the running direction of the airflow in the annular guide tube.
[0022] With the above solution, when the inert gas enters the annular guide tube through the air supply port, its kinetic energy will decay as the stroke increases, resulting in a lower jet velocity at the jet port that is farther from the air supply port, which causes inconsistent flow rates at jet ports at different positions, thereby reducing the uniformity of the flow field distribution in the ash bin. In order to reduce the above impact, gradually increasing the diameter of the jet port along the running direction of the airflow in the annular guide tube can effectively increase the air outlet area of a single jet port, thereby ensuring the consistency of the flow rates of each jet port, thereby making the flow field distribution in the ash bin more uniform.
[0023] Preferably, a first position sensor is provided on the inner wall of the ash bucket near its upper portion, and a controller is coupled to the first position sensor. The first switch, the second switch, the third switch and the power source are all coupled to and controlled by the controller. When the ash in the ash bucket rises to the height of the first position sensor so that the first position sensor is triggered, the controller first starts the power source to drive the agitator to run, and then controls the first switch to cut off the ash discharge pipe and controls the second switch to turn on the ash conveying pipe, and at the same time controls the third switch to turn on the air supply pipe, so that the air source can output inert gas to the ash bucket through the air supply pipe.
[0024] By adopting the above scheme, when the ash in the ash bucket accumulates to a certain level, the ash processing device can operate automatically, eliminating the trouble of manual operation and further improving the operating efficiency and convenience.
[0025] Preferably, the ash bucket is provided with a pressure sensor for detecting pressure changes in the ash bucket and coupled to the controller, the controller is coupled with an alarm, and a first delay time and a first pressure threshold are preset in the controller; when the ash in the ash bucket rises to the height where the first position sensor is located, the controller first controls the first switch to cut off the ash discharge pipe and controls the second switch to remain in the state of cutting off the ash conveying pipeline, and at the same time controls the third switch to turn on the air supply pipe, and controls the power source to operate, so that the ash bucket enters a pressure maintaining state; after the first delay time, the controller obtains the pressure value in the ash bucket through the pressure sensor, and if the measured pressure value is greater than or equal to the first pressure threshold, the controller controls the second switch to turn on the ash conveying pipeline; conversely, if the measured pressure value is less than the first pressure threshold, the controller controls the alarm to sound an alarm.
[0026] With the above scheme, when the ash in the ash bucket reaches the upper limit, the inlet and outlet of the ash bucket are sealed by the first switch and the second switch respectively, and at the same time, the air source can inject inert gas into the ash bucket through the air supply pipe to put the ash bucket into a pressure-maintaining state. After the first delay time, if the pressure value in the ash bucket measured by the pressure sensor is greater than or equal to the first pressure threshold, it means that the airtightness of the entire ash treatment device is good. At this time, the controller controls the second switch to turn on the ash conveying pipeline to carry out the ash treatment process. On the contrary, if the measured pressure value is less than the first pressure threshold, it means that there is a problem with the airtightness of the ash treatment device, then the controller can control the alarm to sound an alarm to remind the operator to take corresponding measures in time to avoid air entering the ash treatment device and causing danger.
[0027] Preferably, a second position sensor is provided on the inner wall of the ash bucket near its lower portion, and a second delay time and a second pressure threshold are preset in the controller; when the ash in the ash bucket drops to the height of the second position sensor so that the second position sensor is triggered, the controller controls the third switch to cut off the air supply pipe after the second delay time to relieve the pressure in the ash bucket; when the pressure sensor detects that the pressure value in the ash bucket is lower than the second pressure threshold, the controller first controls the second switch to cut off the ash conveying pipe, and then controls the first switch to turn on the ash discharge pipe.
[0028] With the above scheme, as the ash in the ash bucket is processed and cleaned, when the ash drops to the lower limit of the ash bucket, the ash handling device can continue to operate for a period of time to ensure that the ash in the ash conveying pipeline can be fully purged. When the second delay time is reached, the controller first controls the third switch to cut off the air supply pipe to stop the air supply from the air source and put the ash bucket into a pressure relief state. After the second delay time, when the pressure value in the ash bucket is lower than the second pressure threshold, the controller first controls the second switch to cut off the ash conveying pipeline, and then controls the first switch to turn on the ash discharge pipe, so that the small positive pressure in the ash bucket impacts the remaining ash at the bottom of the filter, and the remaining ash falls into the ash bucket, while allowing the ash bucket to continue to collect the ash that falls from the filter. In this way, the ash can be cleaned more thoroughly and the filter and the ash handling device can work without stopping.
[0029] Preferably, a third delay time is preset in the controller. When the first switch reopens the ash discharge pipe, the controller controls the power source to continue running. After the third delay time, the controller controls the power source to shut down to stop the agitator.
[0030] With the above solution, after the ash treatment is completed, the power source and the stirring paddle can continue to operate for a period of time to allow the ash and the flame retardant liquid to be fully mixed and evenly wetted, making the ash treatment more thorough and further improving safety.
[0031] The utility model has a significant technical effect due to the adoption of the above technical solution: during the ash treatment process, the operator only needs to control the first switch and the second switch and regularly treat the ash-liquid mixture after passivation, and no manual intervention is required for other treatment processes. In this way, the operator can be prevented from directly contacting flammable and explosive substances (i.e. ash), thereby improving safety and improving operating efficiency and convenience. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 It is a structural schematic diagram of a dust removal system in the prior art;
[0033] Figure 2 It is a schematic diagram of the operation of the filter in the prior art when back-blowing dust removal;
[0034] Figure 3 The structure of this embodiment is shown in FIG. Figure 1 ;
[0035] Figure 4 The structure of this embodiment is shown in FIG. Figure 2 ;
[0036] Figure 5 The structure of this embodiment is shown in FIG. Figure 3 ;
[0037] Figure 6 The structure of this embodiment is shown in FIG. Figure 4 ;
[0038] Figure 7 2 is a system architecture diagram of this embodiment.
[0039] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. filter; 2. ash bucket; 3. ash discharge pipe; 4. first switch; 5. ash conveying pipeline; 6. closed container; 7. flame retardant liquid; 8. second switch; 9. air source; 10. third switch; 11. stirring paddle; 12. power source; 13. cutting mesh; 14. exhaust port; 15. annular guide pipe; 16. air supply port; 17. jet nozzle; 18. first position sensor; 19. controller; 20. pressure sensor; 21. alarm; 22. second position sensor; 23. filter element; 24. clean air chamber; 25. dust gas chamber; 26. air inlet duct; 27. printing device; 28. air outlet; 29. air outlet duct; 30. air inlet; 31. power fan; 32. backblowing device; 33. output shaft. DETAILED DESCRIPTION
[0040] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.
[0041] like Figure 3As shown, the present embodiment discloses a ash safety treatment device for metal 3D printing equipment, comprising a filter 1 and an ash bucket 2 arranged at the bottom of the filter 1, wherein a filter element 23 is arranged in the filter 1 to separate the inner cavity of the filter 1 into a clean air chamber 24 and a dusty air chamber 25 arranged at the upper and lower parts. A back-blowing device 32 connected to the inner cavity of the filter 1 is arranged at the top of the filter 1 to back-blow and remove dust from the filter element 23. An ash discharge pipe 3 is longitudinally arranged between the ash bucket 2 and the filter 1, and a first switch 4 for connecting or disconnecting the ash discharge pipe 3 is arranged on the ash discharge pipe 3. An ash conveying pipe 5 is arranged at the bottom of the ash bucket 2, and the ash conveying pipe 5 extends to a closed container 6 at one end away from the ash bucket 2. The closed container 6 can not only isolate the operator from the flammable substance, play a role in personnel protection, but also prevent the flammable substance from directly contacting with excessive air to cause safety hazards. The closed container 6 contains a flame retardant liquid 7 which submerges the end of the ash conveying pipeline 5 away from the ash bucket 2. The flame retardant liquid 7 may be methyl silicone oil, water or a mixture of the two. The ash conveying pipeline 5 is provided with a second switch 8 for connecting or disconnecting the ash conveying pipeline 5. The side of the ash bucket 2 is connected to a gas source 9 for outputting inert gas through an air supply pipe. The air supply pipe is provided with a third switch 10 for connecting or disconnecting the air supply pipe. The first switch 4 and the second switch 8 are preferably pneumatic butterfly valves, and the third switch 10 is preferably a solenoid valve.
[0042] In this embodiment, when the first switch 4 turns on the ash discharge pipe 3 and the second switch 8 cuts off the ash conveying pipeline 5, and the third switch 10 cuts off the air supply pipe, the ash separated in the filter 1 can fall into the ash bucket 2 through the ash discharge pipe 3.
[0043] When the first switch 4 cuts off the ash discharge pipe 3 and the second switch 8 turns on the ash conveying pipeline 5, and the third switch 10 turns on the air supply pipe, the gas source 9 can output inert gas to the ash bucket 2 through the air supply pipe to blow the ash in the ash bucket 2 into the flame retardant liquid 7 through the ash conveying pipeline 5.
[0044] like Figure 3 As shown, in order to facilitate the exhaust of inert gas from the closed container 6 so that the entire ash treatment device can operate normally, an exhaust port 14 is opened on the top of the closed container 6.
[0045] like Figure 3 As shown, in order to fully mix the ash and the flame retardant liquid 7, a stirring paddle 11 is provided in the flame retardant liquid 7, and a power source 12 connected to the stirring paddle 11 to drive the stirring paddle 11 is provided on the closed container 6. The power source 12 is preferably a motor fixed to the top of the closed container 6, and its output shaft 33 passes through the closed container 6 and is connected to the stirring paddle 11.
[0046] like Figure 4As shown, in order to allow the ash carried by the larger bubbles in the closed container 6 to be fully mixed with the flame retardant liquid 7, a cutting mesh 13 for cutting bubbles is provided at the port of the ash conveying pipeline 5 away from the ash bucket 2.
[0047] like Figure 5 and Figure 6 As shown, in order to improve the cleaning efficiency in the ash bucket 2 and reduce the loss of inert gas, the inner wall of the ash bucket 2 is provided with a circle of annular guide pipe 15, and the cross section of the annular guide pipe 15 is square. Both sides of the annular guide pipe 15 are provided with air supply ports 16 extending outward to the outside of the ash bucket 2. Two air supply pipes are provided and are respectively connected to the two air supply ports 16. Both air supply pipes are connected to the gas source 9 to receive the inert gas output by the gas source 9. Two third switchers 10 are also provided and are respectively provided on the two air supply pipes, so as to control the opening and closing of the two air supply pipes respectively. The annular lower end surface of the annular guide pipe 15 is provided with a plurality of jet ports 17, and the diameters of the plurality of jet ports 17 increase successively along the running direction of the airflow in the annular guide pipe 15.
[0048] like Figure 3 and Figure 7 As shown, in order to realize the automatic operation of the ash treatment device, a first position sensor 18 is provided on the inner wall of the ash bucket 2 and near the upper position thereof. The first position sensor 18 is preferably a level meter or an electric eye. A controller 19 is coupled to the first position sensor 18, and the controller 19 is preferably a PLC. The backflush device 32, the first switch 4, the second switch 8, the third switch 10 and the power source 12 are all coupled and controlled by the controller 19. In this embodiment, when the ash in the ash bucket 2 rises to the height of the first position sensor 18 so that the first position sensor 18 is triggered, indicating that the ash in the ash bucket 2 has reached the upper limit, the controller 19 first starts the power source 12 to drive the stirring paddle 11 to operate, and then controls the first switch 4 to cut off the ash discharge pipe 3 and controls the second switch 8 to connect the ash conveying pipeline 5, and at the same time controls the third switch 10 to connect the air supply pipe, so that the gas source 9 can output inert gas to the ash bucket 2 through the air supply pipe. The airflow formed by the inert gas can carry the ash in the ash bucket 2 through the ash conveying pipe 5 and the cutting mesh 13 in sequence, and finally enter the flame retardant solution, and is fully mixed with the flame retardant solution through the stirring paddle 11, so as to achieve safe treatment of the ash. In this process, excess inert gas can be discharged through the exhaust port 14 to ensure the normal operation of the entire ash treatment device.
[0049] like Figure 3 and Figure 7As shown, in order to test the airtightness of the ash treatment device, the ash bucket 2 is provided with a pressure sensor 20 for detecting the pressure change in the ash bucket 2 and coupled to the controller 19. The controller 19 is coupled with an alarm 21, which is preferably a speaker. The controller 19 is preset with a first delay time and a first pressure threshold. When the ash in the ash bucket 2 rises to the height of the first position sensor 18, the controller 19 first controls the first switch 4 to cut off the ash discharge pipe 3 and controls the second switch 8 to remain in the state of cutting off the ash conveying pipeline 5, and at the same time controls the third switch 10 to connect the air supply pipe, and controls the power source 12 to operate, so that the ash bucket 2 enters the pressure-maintaining state. After the first delay time, the controller 19 obtains the pressure value in the ash bucket 2 through the pressure sensor 20. If the measured pressure value is greater than or equal to the first pressure threshold, it means that the airtightness of the ash treatment device is good, and the controller 19 controls the second switch 8 to connect the ash conveying pipeline 5 to perform ash treatment. On the contrary, if the measured pressure value is less than the first pressure threshold, indicating that the airtightness of the ash treatment device does not meet the standard, the controller 19 controls the alarm 21 to sound an alarm to remind the operator to perform maintenance in time.
[0050] like Figure 3 and Figure 7 As shown, in order to realize the automatic shutdown of the ash treatment device, a second position sensor 22 is provided on the inner wall of the ash bucket 2 and near its lower position. The second position sensor 22 is also preferably a level meter or an electric eye. The controller 19 is preset with a second delay time and a second pressure threshold. When the ash in the ash bucket 2 drops to the height where the second position sensor 22 is located so that the second position sensor 22 is triggered, it means that the ash in the ash bucket 2 has reached the lower limit. Then, after the second delay time, the controller 19 controls the third switch 10 to cut off the air supply pipe so that the ash bucket 2 is automatically depressurized. When the pressure sensor 20 detects that the pressure value in the ash bucket 2 is lower than the second pressure threshold, it means that the inside of the ash bucket 2 is already in a micro-pressure state. Then, the controller 19 first controls the second switch 8 to cut off the ash conveying pipeline 5 to seal the outlet of the ash bucket 2. Then, the first switch 4 is controlled to conduct the ash discharge pipe 3, so that the slight positive pressure in the ash bucket 2 can impact the ash residue remaining at the bottom of the ash bucket 2, and the remaining ash residue falls into the ash bucket 2 through the ash discharge pipe 3, so that the ash residue treatment is more thorough. At the same time, the ash bucket 2 can continue to collect the ash residue dropped from the filter 1, so that the filter 1 and the ash residue treatment device can work without stopping.
[0051] In order to allow the ash to be fully mixed with the flame retardant liquid 7 and evenly moistened, a third delay time is preset in the controller 19. When the first switch 4 reopens the ash discharge pipe 3, the controller 19 controls the power source 12 to continue running. After the third delay time, the controller 19 controls the power source 12 to shut down so that the agitator 11 stops running.
[0052] The above control process can be implemented with the help of a program built into the controller 19, which is common knowledge in the art and will not be elaborated here.
Claims
1. A slag safety treatment device for metal 3D printing equipment, comprising a filter (1) and an ash bucket (2) arranged at the bottom of the filter (1), characterized in that: An ash discharge pipe (3) is arranged between the ash bucket (2) and the filter (1), and a first switch (4) for opening or closing the ash discharge pipe (3) is arranged on the ash discharge pipe (3); an ash conveying pipe (5) is arranged at the bottom of the ash bucket (2); an end of the ash conveying pipe (5) away from the ash bucket (2) extends into a closed container (6); the closed container (6) contains a flame retardant liquid (7) that immerses the end of the ash conveying pipe (5) away from the ash bucket (2); a second switch (8) for opening or closing the ash conveying pipe (5) is arranged on the ash conveying pipe (5); a gas source (9) for outputting inert gas is connected to the side of the ash bucket (2) through an air supply pipe, and a third switch (10) for opening or closing the air supply pipe is arranged on the air supply pipe; When the first switch (4) switches on the ash discharge pipe (3) and the second switch (8) cuts off the ash conveying pipe (5), and the third switch (10) cuts off the air supply pipe, the ash separated in the filter (1) can fall into the ash bucket (2) through the ash discharge pipe (3); When the first switch (4) cuts off the ash discharge pipe (3) and the second switch (8) switches on the ash conveying pipe (5), and at the same time the third switch (10) switches on the air supply pipe, the gas source (9) can output inert gas to the ash bucket (2) through the air supply pipe, so as to blow the ash in the ash bucket (2) into the flame retardant liquid (7) through the ash conveying pipe (5).
2. The ash safety treatment device for metal 3D printing equipment according to claim 1 is characterized in that: A stirring paddle (11) is arranged in the flame retardant liquid (7), and a power source (12) connected to the stirring paddle (11) to drive the stirring paddle (11) to operate is arranged on the sealed container (6).
3. The ash safety treatment device for metal 3D printing equipment according to claim 1 is characterized in that: A cutting mesh surface (13) for cutting bubbles is provided at a port of the ash conveying pipeline (5) away from the ash bucket (2).
4. The ash safety treatment device for metal 3D printing equipment according to claim 1 is characterized in that: An exhaust port (14) is provided on the top of the sealed container (6).
5. The ash safety treatment device for metal 3D printing equipment according to claim 1 is characterized in that: An annular flow guide pipe (15) is provided around the inner wall of the ash bucket (2), and air supply ports (16) extending outward to the outside of the ash bucket (2) are provided on both sides of the annular flow guide pipe (15). Two air supply pipes are provided and are respectively connected to the two air supply ports (16). Both air supply pipes are connected to the gas source (9) to receive the inert gas output by the gas source (9). Two third switchers (10) are also provided and are respectively arranged on the two air supply pipes. A plurality of air injection ports (17) are provided around the annular lower end surface of the annular flow guide pipe (15).
6. The ash safety treatment device for metal 3D printing equipment according to claim 5 is characterized in that: The diameters of the plurality of air jets (17) increase in sequence along the running direction of the airflow in the annular flow guide tube (15).